On an episode of Jay Leno's Garage, he was talking about his Gullwing 300SL and he said that while Mercedes might not stock the part, they have the original blueprint and can manufacture you any part you need for your classic Mercedes. I think he needed something silly like the fuel injection intake plenum and that set him back $7000.

Hyundai has a program like that. I needed an upper sump a few years back and they had none in stock. I placed my order and 9 weeks later, they shipped me a brand new (stamped the previous month!). It was only $700.

When the dealership thought I needed a new trans, same deal. Hyundai would manufacture a new one to the tune of $8000 Cdn. Lucky me, I found an NOS one sitting in a transmission shop in California. The owner was happy to get $1200 US for it. Joke was on me though, it was a clutch failure.